BACKGROUND OF THE INVENTION
1. Field of the Invention
[0001] This invention relates to the construction of an air conditioner, especially an air
conditioner provided with a cross flow fan as a blower.
2. Description of the Prior Art
[0002] Conventionally, an air conditioner provided with a casing (having an air inlet at
its upper side, an air outlet at its lower side and an air flowing passage from the
sir inlet to the air outlet), a cross flow fan (also known as "tangential fan" or
"transverse fan") and a heat exchanger has been known.
[0003] As a heat exchanger for the above air conditioner, the cross fin coil comprising
many heat transfer tubes fitted with many panel-shaped fins (cross fins) in passing
through state is known (for example, Japanese Utility Model Registration Publication
No.58-49503).
[0004] However, the speed of flowing air by the above cross flow fan has such characteristic
that it is faster at one side of the flowing air passage and slower at the other side.
Due to this drift of air flowing, distribution of the air flowing speed to the heat
exchanger varies. Therefore, in the cross fin coil with the above heat transfer tube
branched into plural passes which are disposed in parallel with the axial direction
of the cross flow fan, distribution of air flowing speed end distribution of heat
load in air flowing direction (change of temperature) of passes vary with each other
and it is difficult to obtain heat exchanging capacity of high level.
[0005] It is true that by disposing each pass of the heat transfer tube in the direction
crossing nearly at a right angle to the axial direction of the cross flow fan, unbalance
of heat exchanging capacity caused by drift of flowing air can be avoided.
[0006] However, in the above case the fin which crosses at a right angle to the heat transfer
tube is arranged in the direction in parallel with the axis of the cross flow fan.
Therefore, in the case where a heat exchanger is used as an evaporator, for example,
a drain receiver which receives water condensed at the cross fin coil is arranged
at the position of each fin in parallel with the axis of the cross flow fan. This
arrangement of the drain receiver results in narrowing the air flowing passage and
lessening the area of the passage. However, if this drain receiver is omitted, drain
water falls onto the air flowing passage directly from the fin and this raises a problem
in practical use.
[0007] An object of the present invention is to improve the construction of the above heat
exchanger, more particularly, to prevent reduction of heat exchanging capacity due
to drift of air flowing by using a heat exchanger of mesh-shaped fin type, without
raising the problem of drain receiver.
SUMMARY OF THE INVENTION
[0008] In order to attain the above object, the air conditioner according to the present
invention is provided with a casing having an air inlet at its upper side, an air
outlet at its lower side and an air flowing passage extending from the air inlet to
the air outlet, a cross flow fan and a heat exchanger arranged in series at the air
flowing passage in the casing.
[0009] The heat exchanger mentioned above comprises fins of mesh type and heat transfer
tubes. The heat transfer tube is branched into plural passes in parallel which are
arranged in the direction intersecting the axial direction of the fan (including the
direction intersecting at a right angle).
[0010] The mesh-shaped fin may be a panel capable of passing air through, such as metal
mesh, expanded metal, punched plate, foam metal. The examples of the fin are shown
in Figs.16-19.
[0011] In the above case, the heat exchanger is basically arranged on the downward slant
to the front in relation to the casing and the intermediate part of the heat transfer
tube in lengthwise direction bends at an acute angle so that it projects upwardly.
A drain receiving means, such as a drain pan, for receiving drain from the heat exchanger
may be provided below a front end portion and below a rear end portion of the heat
exchanger.
[0012] Alternatively, the heat exchanger is basically arranged on the downward slant to
the front in relation to the casing and the intermediate part of the heat transfer
tube in lengthwise direction bends at an obtuse angle so that it projects upwardly
and frontwardly.
[0013] Also, the heat exchanger may be arranged in such a fashion that it slants downwardly
to the front in relation to the casing, with no bending at the intermediate part.
[0014] Each pass of the heat transfer tube extends from one end of the heat exchanger to
the other end, without being subjected to a bending process in the surface including
fins. Alternatively, each pass of the heat transfer tube is subjected to a bending
process in the same surface so that it has at least one reciprocating route of extending
from one end of the heat exchanger to the other end, where it bends toward the one
end. In this case, the same surface including fins bends at the intermediate part
of the heat transfer tube in lengthwise direction, for example. Furthermore, the heat
exchanger may comprise plural modules connected together which are folded at the boundary
part between modules in layers in vertical direction and each pass of the heat transfer
tube in each module may be subjected to a bending process in the same surface so that
it goes through a reciprocating route from one end of the module and then bends again
at the one end to the other end side and extends toward the other end. This composition
will facilitate manufacturing of the heat exchanger. Also, if each pass of the heat
transfer tube at the boundary part of the above module is set slant to the lengthwise
direction of the heat transfer tube, a bending radius of the pass at the boundary
part becomes large and breakage of it the can be prevented.
[0015] Alternatively, the heat exchanger may be composed in such a fashion that a plurality
of modules are arrange in layers in vertical direction and each module is composed
by connecting a plurality of mesh-shaped fine in layers to each pass of the heat transfer
tube.
[0016] The air inlet is opened at the upper surface or at the upper surface. The heat exchanger
to be arranged at the air flowing passage in the casing basically may be arranged
on the downward slant to the front in relation to the casing and the intermediate
part of the heat transfer tube in lengthwise direction may be bent at an acute angle
so that it projects upwardly.
BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The nature and advantages of the present invention will be understood more clearly
from the following description made with reference to the accompanying drawings, in
which:
Fig.1 is a cross section, along the vertical direction, of the air conditioner in
Embodiment 1;
Fig.2 is a perspective view of the heat exchanger module in Embodiment 1;
Fig.3 is a plan view of the heat exchanger module in Embodiment 1;
Fig.4 is a cross section, showing typically the air conditioner in Embodiment 2;
Fig.5 is a perspective view of the heat exchanger module in Embodiment 2;
Fig.6 is a cross section, showing typicaly the air conditioner in Embodiment 3;
Fig.7 is a perspective view of the heat exchanger module in Embodiment 3;
Fig.8 is a perspective view of the heat exchanger in Embodiment 4;
Fig.9 is a plan view, showing the state of the heat exchanger before processing;
Fig.10 is a perspective view of the heat exchanger in Embodiment 5;
Fig.11 is a perspective view of the heat exchanger in Embodiment 5 as it is disassembled;
Fig.12 is a cross section, showing typically the air conditioner in Embodiment 6;
Fig.13 is a cross section, showing typically the air condition in Embodiment 7;
Fig.14 is a cross section, along the vertical direction of the air conditioner in
Embodiment 8;
Fig.15 is a cross section, showing typically the air conditioner in Embodiment 9;
and
Fig.16 through Fig.19 are respectively perspective views, each showing the mesh-shaped
fin.
DESCRIPTION OF PREFERRED EMBODIMENT
Embodiment 1:
[0018] Fig.1 through Fig.3 show Embodiment 1 of the present invention. In Fig.1, reference
numeral 1 designates a casing of a wall type air conditioner to be fixed to a wall
20 close to a ceiling 21 in the room. This casing 1 is rectangular box-shaped and
has an air inlet 2 opened at its upper surface and an air outlet 4 at a corner part
of its front lower part. An air flowing passage 5 is formed in the casing 1, extending
from the air inlet 2 to the air outlet 4. A heat exchanger 10 and a cross flow fan
6 are arranged in series, from the air inlet 2 side toward the air outlet 4 side,
in the air flowing passage 5.
[0019] As shown by a virtual line in Fig.1, the air in the room is taken in the casing 1
from the air inlet 2 by the cross flow fan 6 and the air taken in is heat exchanged
by the heat exchanger 10 and is blown off from the air outlet 4.
[0020] The above cross flow fan 6 has an axial center 6a arranged in such a fashion that
it crosses the air flowing passage 5 in right and left direction (in Fig.1, the direction
crossing at a right angle to the drawing paper). By rotating an impeller 7 around
the axial canter 6a, the air is passed through along the surface crossing at a right
angle to the axial center 6a.
[0021] The heat exchanger 10 is connected to a distributer and a header (not shown in the
drawings) and between them. It comprises a plurality (seven in Fig.1) of modules 11
arranged in layers in vertical direction. As illustrated in Fig.2 and Fig.3 on an
enlarged scale, each module 11 comprises a heat transfer tube 12 which connects a
distributer and a header and mesh-shaped fins which are connected to the outer surface
of the heat transfer tube 12 along the lengthwise direction of it and through which
the air is allowed to flow through. The heat transfer tube 12 is branched into plural
passes 12a in parallel in the heat exchanger 10. As a feature of the present invention,
each pass 12a of the heat transfer tuba 12 is arranged in parallel along the plane
(In Fig.1, the direction in parallel with the drawing paper) crossing at a right angle
to the axial direction of the cross flow fan 6. The heat exchanger 10 is generally
arranged on the downward slant to the front in relation to the casing 1 and bends
at an acute angle so that the rear part (from the center) of the lengthwise direction
of the heat transfer tube 12 projects upwardly.
[0022] As shown in Fig.3, in each module 11 each pass 12a of the heat transfer tube 12 is
subjected to a bending process in the same surface including fins 13 so that it extends
from one end (for example, a forward end) of the heat exchanger 10 to the other end
(a rear end), where it bends toward the one end side and bends again at the one end
to the other end side and extends out to the other end side. The same surface including
fins 13 mentioned above is the surface along the heat exchanger 10, which bends at
an acute angle so that the rear part (from the center) of the lengthwise direction
of the heat transfer tube 12 may project upwardly.
[0023] Drain pans 14, 15 for receiving drain from the heat exchanger 10 are provided below
the front and part and below the rear end part of the heat exchanger 10 in the casing
1.
[0024] In this embodiment, by rotation of the cross flow fan 6 (in anticlockwise direction
in Fig.1) the air in the room is taken into the casing 1 from the air inlet 2, the
air taken in is heat exchanged by the heat exchanger 10 and is cooled or heated to
the specified temperature and then is blown off from the air outlet 4.
[0025] Since each pass 12a of the heat transfer tube 12 in the heat exchanger 10 is arranged
along the plane crossing at a right angle to the axial direction of the cross flow
fan 6, even if drift of the air is caused at the air flowing passage 5 by the cross
flow fan 6, the heat transfer tube 12 is to be arranged, ranging from the port where
the amount of flowing air is large to the part where the amount of flowing air is
small. More particularly, even if the heat transfer tube 12 assumes the form of independence
of passes 12a each other, the heat transfer tube 12 is barely influenced by the distribution
of flowing speed of the air passing through the heat exchanger 10 and accordingly
it is possible to make the distribution of air flowing speed and distribution of heat
load in air flowing direction at each pass 12a almost equal. Therefore, if only distribution
of refrigerant to passes 12a is set equally by a distributor, drift of refrigerant
due to change of heat load caused by drift of the air can be prevented and heat exchanging
capacity of high level can be ensured.
[0026] Since the heat exchanger 10 is arranged on the downward slant to the front in relation
to the casing 1 and the intermediate part of the heat transfer tube 12 in lengthwise
direction bends at an acute angle so that it projects upwardly, in comparison with
the case of a plane-shaped heat exchanger (with no bending) the heat transferring
area of the heat exchanger 10 par unit cross sectional area of the air flowing passage
5 is large and heat exchanging capacity is improved to a large extent.
[0027] Moreover, since the heat exchanger 10 comprises modules 11 with mesh-shaped fins
13 connected to the outer surface of the heat transfer tube 12, even if condensed
water is generated at the heat exchanger 10, the condensed water flows down along
the heat transfer tube 12 and fins 13. At the front side from the upper end bent part
of the heat exchanger 10 condensed water flows into the drain pan 14 disposed below
the front end portion of the heat exchanger 10 and at the rear side condensed water
flows into the drain pan 15 disposed below the rear end portion of the heat exchanger
10 and finally condensed water is discharged from the casing 1. Therefore, notwithstanding
that the intermediate part of the heat transfer tube 12 in lengthwise direction bends
at an acute angle and projects upwardly, condensed water can be discharged accurately.
This ensures improvement of heat exchanging capacity due to the increase in heat transferring
area of the heat exchanger 10 and smooth discharging of condensed water.
Embodiment 2:
[0028] Fig.4 shows typically an air conditioner in Embodiment 2. In this and following embodiments,
those parts which are the same as those in Embodiment 1 are given the same reference
numerals and description of them is omitted.
[0029] In this embodiment, an air inlet 3 is opened at the front upper part of the casing
1, in addition to the air inlet 2 at the upper part. Similarly to Embodiment 1, the
heat exchanger 10 has a plurality of modules 11 in layers in vertical direction. As
shown in Fig.5, each module 11 (heat exchanger 10) is basically arranged on the downward
slant to the front in relation to the casing 1 and the intermediate part of its heat
transfer tube 12 in lengthwise direction bends at an acute angle so that it projects
upwardly to the front.
Embodiment 3:
[0030] Fig.6 shows the air conditioner in Embodiment 3. In this embodiment, as shown in
Fig.7 each module 11 in the heat exchanger 10 is arranged on the downward slant to
the front in relation to the casing 1 and is plane-shaped. Each pass 12a of the heat
transfer tube 12 extends rectinearly from a front end to a rear end of the heat exchanger
10, without being subjected to a bending process in the plane including fins 13 in
the case of Embodiment 1.
Embodiment 4:
[0031] Fig.8 shows the heat exchanger 10 in Embodiment 4. In this embodiment, manufacturing
of the heat exchanger 10 composed by a plurality of modules in layers in vertical
direction is facilitated. As shown in Fig.9, in this embodiment plural modules 11
are made into one large panel-shaped module by putting plural passes 12a of the heat
transfer tube 12 between plural mesh-shaped fins 13, corresponding to several times
(thrice in Fig.9) the size of each module 11, in the heat exchanger 10. In each module
11, each pass 12a of the heat transfer tube 12 is subjected to a bending process in
the same plane so that it extends from one end of the module 11 to the other end,
where it bends toward the one end side and bends again at the one end to the other
end side and then extends out to the other end side. Passes 12a of the heat transfer
tube 12 in the intermediate module 11 are connected to passes 12a of the adjoining
modules 11 at the boundary part 10a and at this boundary part 10a, each pass 12a is
slant in relation to the lengthwise direction of the heat transfer tube 12 (right
and left direction in Fig.9).
[0032] By folding the panel-shaped module 11 at the boundary parts 10a, plural modules 11
are laid in layers. These modules in layers are used as a heat exchanger 10. At this
time, each pass 12a of the heat transfer tube 12 is folded at the boundary part 10a
between modules 11 but since each pass 12a is slant at the boundary part 10a in relation
to the lengthwise direction of the heat transfer tube 12, its bending radius becomes
large and breakage of each pass 12a can be prevented. Where necessary, this heat exchanger
10 may be folded as in the cases of Embodiments 1 and 2. Reference numeral 8 designates
a distributor and reference numeral 9 designates a header.
[0033] In this embodiment, manufacturing of the heat exchanger 10 is easy and the continuous
manufacturing operation is possible. Accordingly, productivity is improved. Also,
U-shaped tubes for bent parts in the pass 12a of the heat transfer tube 12 are unnecessary.
Furthermore, by changing the bending position (position of the boundary part 10a)
between modules 11, face area of the heat exchanger 10 can be easily changed.
Embodiment 5:
[0034] Fig. 10 and Fig. 11 show Embodiment 5. Similarly to Embodiment 1, in this embodiment
the heat exchanger 10 is composed by laying plural modules in layers in vertical direction.
Each module 11 is composed by connecting plural mesh-shaped fins in layers to each
pass 12a of heat transfer tube 12. Fins 13 vary in kind from the inside (on the heat
transfer tube 12 side) toward the outside. Fins 13 at the inside have grooves 13a
in which the heat transfer tube 12 is set. As to the depth of the groove 13a of the
intermediate fins 13, the more the fin is outer, the smaller the depth of its groove.
The fin 13 at the outermost part has no groove 13a. As shown in Fig.10, the heat exchanger
10 is manufactured by laying fins 13 in layers one after another and connecting them
to the heat transfer tube 12.
Embodiment 6:
[0035] Fig.12 shows typically an air conditioner in Embodiment 6. In this embodiment, the
heat exchanger 10 is arranged on the downward slant to the front in relation to the
casing 1 and a rear end thereof is at the highest position. The heat exchanger 10
is bent frontwardly and slant at two places at an obtuse angle (front and rear sides
from the center of the heat transfer tube 12 in lengthwise direction) and its front
part extends almost perpendicularly.
Embodiment 7:
[0036] Fig.13 shows typically Embodiment 7. The heat exchanger 10 bends at an acute angle
at the rear side part from the center of the heat transfer tuber 12 in lengthwise
direction so that it projects upwardly. Front side of the bent part extends almost
perpendicularly and the front end part slants downwardly to the rear.
Embodiment 8:
[0037] Fig.14 shows an air conditioner in Embodiment 8. This embodiment is similar to Embodiment
7, excepting that a slant part which slants downward to the front is formed between
an upper end bent part and a perpendicular part of the heat exchanger 10. Reference
numeral 16 designates a louver arranged at the air outlet 4. This louver changes the
air blowing direction up and down. Reference numeral 17 designates a louver arranged
at the immediate upstream side of the louver 16. This louver 17 exchanges the air
blowing direction right and left. In this embodiment, owing to the shape of the above-mentioned
heat exchanger 10, it is possible to arrange each fin 13 in the direction crossing
at a right angle to the whole of flowing passage 5 from the air inlets 2, 3 and heat
exchanging capacity of high level can be obtained.
Embodiment 9:
[0038] Fig.15 shows Embodiment 9. The heat exchange 10 is arranged on the downward slant
to the front in relation to the casing 1 and its rear end is at the highest position.
The heat exchanger 10 is bent frontwardly and aslant at an obtuse angle at two places
(at the front and rear sides from the center of the heat transfer tube 12 in lengthwise
direction). The part between the both bent parts is bent rearwardly and aslant or
is nearly M-shaped as seen from the side.
[0039] The front lower part of the casing 1 may be angular, providing the air out let 4
only there at.
1. An air conditioner comprising:
a casing having an air inlet opened at the upper side thereof, an air outlet opened
at the lower side thereof and an air flowing passage extending from said air inlet
to said air outlet, and a cross flow fan and
a heat exchanger disposed in series at said air flowing, passage in said casing, said
heat exchanger comprising mesh type fins and a heat transfer tube, said heat transfer
tube being branched into plural passes in parallel in said heat exchanger and being
disposed in the direction intersecting the axial direction of said cross flow fan.
2. An air conditioner as defined in Claim 1, wherein the heat exchanger is basically
disposed on the downward slant to the front in relation to the casing and the intermediate
part of the heat transfer tuber in lengthwise direction bends at an acute angle so
that it projects upwardly.
3. An air conditioner as defined in Claim 1, wherein the heat exchanger is basically
disposed on the downward slant to the front in relation to the casing and the intermediate
part of the heat transfer tuber in lengthwise direction bends at an obtuse angle so
that it projects upwardly to the front.
4. An air conditioner as defined in Claim 1, wherein the heat exchanger is disposed
on the downward slant to the front in relation to the casing and is plane-shaped.
5. An air conditioner as defined in Claim 2, wherein a drain receiving means for receiving
drain from the heat exchanger is provided below the front end portion and below the
rear end portion of the heat exchanger.
6. An air conditioner as defined in Claim 1, wherein each pass of the heat transfer
tube extends from one end of the heat exchanger to the other end thereof, without
being subjected to a bending process in the surface including fins.
7. An air conditioner as defined in Claim 1, wherein each pass of the heat transfer
tube is subjected to a bending process in the same surface including fins so that
it has at least one reciprocating route of extending from one end of the heat exchanger
to the other end thereof, where it bends toward the one end.
8. An air conditioner as defined in Claim 7, wherein the same surface including fins
bends at the intermediate part of the heat transfer tube in lengthwise direction.
9. An air conditioner as defined in Claim 7, wherein the heat exchanger is composed
of a plurality of modules connected together which are folded at the boundary part
between modules in layers in vertical direction and each pass of the heat transfer
tube in each module is subjected to a bending process in the same surface so that
it goes through a reciprocating route from one end of the module and then bends again
at the one end to the other end side and extends toward the other end.
10. An air conditioner as defined in Claim 9, wherein each pass of the heat transfer
tube at the boundary part between modules is slant in relation to the lengthwise direction
of the heat transfer tube.
11. An air conditioner as defined in Claim 1, wherein the heat exchanger is composed
of a plurality of mesh-shaped fins in layers to each pass of the heat transfer tube.
12. An air conditioner as defined in Claim 1, wherein the air inlet is opened at the
upper surface or at the upper surface of the casing.
13. An air conditioner as defined in Claim 1, wherein the heat exchanger is basically
disposed on the downward slant to the front in relation to the casing and the heat
transfer tube bends at an actute angle so that the intermediate part of the heat transfer
tube in lengthwise direction projects upwardly.